Horizontal band saw machine

ABSTRACT

Horizontal-type band saw machine which maintains the band saw blade at a travelling speed selected depending upon the property and shape of the material to be machined, introducing operating fluid of a hydraulic mechanism controlling the raising and lowering of a housing, which accommodates said band saw blade, into a plunger pump at a speed in accordance with the effective weight of the housing, and sending out the thus introduced operating fluid by driving the plunger pump periodically in a cycle corresponding to the travelling speed of the band saw blade. The machine has a mechanism for imparting a predetermined tension to the band saw blade, a safety mechanism for detecting slippage of the band saw blade, a guide mechanism comprising a combination of a specially arranged roller-shaped guide member and a plate-like guide member, a mechanism comprising members for supporting the back of the band saw blade, a mechanism for detecting conditions of the feeding material, a feed roller mechanism, and a mechanism for securely clamping the sawed pieces.

iinited States ?atent [191 Sata et al.

[ HORIZONTAL BAND SAW MACHINE [75] Inventors: Masao Sata, Sagamihara; Tsuneo Aizawa, lsehara; Kenjl Ohnishl, Sagamihara; Shlgeo Kolzumi, Hatano; Aklo Fukuda, Yokohama; Shinkl Klkuchl, Sagamihara; Shlchiro Kusanagl, Isehara, all of Japan [73] Assignee: Amada Company Limited,

Kanagawa-ken, Japan [22] Filed: July 6, 1971 [2]] Appl. No.: 159,625

[30] Foreign Application Priority Data Aug. 26, 1970 Japan 45/74262 Aug. 26, 1970 Japan 45/74260 Aug. 26, 1970 Japan 45/74261 Sept. 22, 1970 Japan 45/82580 Dec. 3, 1970 Japan 45/106336 Nov. 21, 1970 Japan 45/102424 Dec. 30, 1970 Japan 45/122787 [52] US. Cl 83/168, 83/277, 83/800 [51] Int. Cl 32311 53/00, B23d 55/04 [58] Field of Search 83/277, 282, 794-800, 83/801,168, 169

[56] References Cited UNITED STATES PATENTS 2,898,669 8/1959 Crane et al. 83/800 Aug. 28, 1973 2,602,987 7/l952 Wells 83/800 X Primary Examiner-J. M. Meister Attorney-C. L. Frey 57] ABSTRACT Horizontal-type band saw machine which maintains the band saw blade at a travelling speed selected depending upon the property and shape of the material to be machined, introducing operating fluid of a hydraulic mechanism controlling the raising and lowering of a housing, which accommodates said band saw blade, into a plunger pump at a speed in accordance with the effective weight of the housing, and sending out the thus introduced operating fluid by driving the plunger pump periodically in a cycle corresponding to the travelling speed of the band saw blade. The machine has a mechanism for imparting a predetermined tension to the band saw blade, a safety mechanism for detecting slippage of the band saw blade, a guide mechanism comprising a combination of a specially arranged roller-shaped guide member and a plate-like guide member, a mechanism comprising members for supporting the back of the band saw blade, a mechanism for detecting conditions of the feeding material, a feed roller mechanism, and a mechanism for securely clamping the sawed pieces.

6 Claims, 38 Drawing Figures PAIENIEBmcza ms sum 01 or 21 INVENTORS M- Qi'o mi 41.

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1. A horizontal band saw machine comprising a distributor rotatable with a shaft associated with a driving wheel for the band saw, a plunger constructed such that introduction and discharge of an operating fluid into and out of a hydraulic cylinder is effected by rotational movement of said distributor for lowering a housing for the band saw, the stroke length of said plunger being automatically adjustable by the increase and decrease in the fluid pressure within said cylinder, and the discharging amount of the operating fluid being respectively increased and decreased thereby.
 2. A horizontal band saw machine comprising a mechanism for maintaining the travelling speed of the band saw, depending upon the shape and the quality of the material to be cut, a housing adapted to enclose the band saw, a hydraulic mechanism for lifting and lowering said housing, and a mechanism for introducing operating fluid of said hydraulic mechanism into a plunger pump at a speed corresponding to the effective weight of said housing, said pump being driven in a cycle corresponding to the travelling speed of the band saw for sending out the operating fluid, thereby to control the lowering speed of said housing.
 3. The horizontal band saw machine as defined in claim 2, further comprising a guide mechanism including an upper guide and a lower guide, said upper guide being adapted to press the upper half portion of the band saw from one side thereof, while said lower guide is adapted to press the lower half portion of the band saw from another side thereof, a pair of hard inserts arranged on both sides of the band saw so as to grippingly hold the same, said inserts being in the form of blocks having a plurality of grooves therein to spread a thin layer of cutting oil along the band saw and feed the oil to the workpiece at a speed greater than that of the moving band saw, thereby to form a supplying mechanism, and at least one of said insert blocks being provided with a sliding member anD a spring adapted to press the band saw.
 4. The horizontal band saw machine as defined in claim 2, further comprising a driving wire brush disposed beneath the band saw and forcibly movable on a driving shaft mounted perpendicular to the travelling direction of the band saw, and follower wire brushes mounted each on a shaft disposed perpendicular to the travelling direction of the band saw and flanking the same, said follower wire brushes being independently rotatable, by following the movement of the band saw, and also vertically reciprocable.
 5. The horizontal band saw machine as defined in claim 2, further comprising a wing member attached to a casing box and retractively projecting across the path of the workpiece, said wing member having in one portion thereof a point which is disengageably engaged with a microswitch such that the latter is actuated when said wing member projects over a predetermined length.
 6. The horizontal band saw machine as defined in claim 2, further comprising a fixed fence secured to a fixed vice on the floor of a delivery plate, a movable fence secured to a movable vice on said floor for sliding movement in the direction of the movement of the workpiece, said fixed and said movable fences being spaced away from each other by a distance substantially corresponding to the width of the workpiece. 